Marine Le Pen with her father Jean-Marie Le Pen, at National Front headquarters.

Samuel Bollendorff/The New York Times

FILE — Marine Le Pen, front, heir apparent of her father’s party, the National Front, with her father Jean-Marie Le Pen, at National Front headquarters in Nanterre, France, May 17, 2010. Marine is getting around 20 percent in early opinion polls, putting her about even with the main parties of the right and left.

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